Umbrella



FIG. 1 is a perspective view of an umbrella showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The left view is a mirrorimage of the right view as shown in FIG. 4. 

The ornamental design for an umbrella, as shown in the drawings. 